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The nocking noise you hear either comes from your damper assembly or the icemaker. Push the door switch in so the refrigerator thinks the door is closed. Listen to the noise and if it's coming from the icemaker, heat up the icemaker with a hair dryer in case there is ice blocking the icemaker from rotating properly. If that doesn't resolve the issue, then replace the ice maker. Other than that, if the noise is coming from the vent behind the back wall, that's your damper and that would just need to be replaced if it's knocking.
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